Which exponential expression is equivalent to $$^8\sqrt{y}$$ ?

<div id="id_cont_display" class="markdown-body editormd-html-preview"><textarea>Which exponential expression is equivalent to $$^8\sqrt{y}$$ ?</textarea>Which exponential expression is equivalent to <math><semantics><mrow><msup><mrow></mrow><mn>8</mn></msup><msqrt><mrow><mi>y</mi></mrow></msqrt></mrow><annotation encoding="application/x-tex">^8\sqrt{y}</annotation></semantics></math>​8​​√​y​​​ ?
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